Multifilament electric light bulb



Oct. 26, 1937. N. zAGMEs'rER MULTIFILAMENT ELECTRIC LIGHT BULB Filed June 7, 1957 l4 Sheets-SheerI 1 'Y vvv @fb/YM' N Zagmesef @ma S 4 Sheets-Sheet 2 N. ZAGMESTER MULTIFILAMENT ELECTRIC LIGHT BULB Filed June 7, 193? Oct. 26, 1937.

Oct. 26, 1937. N. zAGMEsrER MULTIVFILAMENT ELECTRIC LIGHT BULB sheets-sheet s Filed June 7, 1937 Oct. 26, 1937. N. zAGMEsTER MULTIFILAMENT ELECTRIC LIGHT BULB F'iled June '7, 1937 4 Sheets-Sheet 4 Patented Oct. 26, 1937 UNITED STATES mi'rEN'r OFFICE 8 Claims.

'I'his invention relates to certain new and usefilill1 1rimprovement in multi-filament electric light b The primary object of the invention is to provide a multi-filament bulb having a body or casing formed of glass and of any shape desired, the same being preferably of heart-shape with a double inner partition Vwall with the outer faces of the partition wall mirrored to increase light reflecting characteristics.-

A further object of the invention is to provide a multi-filament bulb of the foregoing character with a switch device in the basev of the bulb for selectively or simultaneously activating the ii'lament.

With the above and the other objects in view that will become apparent as the nature of the invention is better understood, the same con sists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed.

In the drawings:- Figure 1 is a longitudinal sectional view of a multiple-filament electric light bulbl constructed in accordance with the present invention, showing the outer casing and inner double walled partition with separate illaments in the casing at the inner and outer sides of the partition;

Figure 2 is a fragmentary longitudinal sectional view of the base portion of the'bulb-showing one arm of the multiple-switch device closl one fllaing a pair of contacts for a circuit to ment;

Figure 3 `is a fragmentary longitudinal sectional view, similar to Figure 2, and showing another arm of the multiple-switch device closing another pair of contacts for a circuit to the other filament;

Figure 4 is a fragmentary longitudinal sectional view of the base, portion of the lamp with the multiple-switch device shown in elevation; Figure 5 is a cross-sectional view taken on line 5 5 of Figure 1, showing one lamnt between the outer wall of the bulb vand the inner partition;

Figure 6 is a cross-sectional view taken on line 8 8 oi Figure 1, showing a circular series of hollow ball memberscarried by the outer lside oi-the'double wall partition;

Figure 'I is a cross-sectional view taken on line 1--1 of Figure 1, "showing the oppositely disposed contacts for the two filaments? Figure 8 is a cross-sectional view taken on line 8-8 of Figure 1; i

Figure 9 is a cross-sectional view taken on line 8 of Figure i;

Figure is a longitudinal sectional view on an enlarged scale of the multiple-switch device for operating the separate contacts for closing circuits. to the two illaments; 1

Figure i1 is a cross-sectional view taken on line II--II of Figure 10;

Figure 12 is' a cross-sectional view taken on line I2-I2 :oi Figure 10; f

Figures 13 and 14 show two side elevational views ot the block carrying two resilient contact arms to be selectively and simultaneously operated by the multiple-switch device:

Figure 15 is a side elevational view of a keypiece for mounting in the blocks carrying the resilient contact arms;

Figures 16 and 17 show side and top plan views respectively of a diametrically notched plate in the base of the lamp bulb through which the resilient contact arms extend;

Figures 18, 19 and 20 show side elevational views, partlyln section oi three parts of the the wir- Abase 2 by means of screws B and nut and bolt combinations 1, the base 2 comprising an outer end separate section 2a' to facilitate mounting of the metallic casing to the base.-

A double-walled partition within the shell I oi substantially `bell-shape is formed-integral with'the base section 2 and includes inner and outer walls 9 and I0 integrally formed at the ends adjacent the outer endfof theshell `I as at II with the walls l and I 0 diverging towards the base section 2, the inner end I2 ot the innerwell l being integral with a block Il formed Openings I42 and and I6 and said openings are closed by solder plugs I6. l

The inner face of the partition wall 9 and the outer face ofthe partition wall I0 are mirrored to increase reflecting -characteristics and for additional reflection and ornamental features, the outer wall I6 of the partition adjacent the base section 2 carries a circular series of hollow spherical ball-like projections I1 that may be suitably colored if desired, the heart-shaped shell I carrying an annular enlargement Ia in the form of an outward bulge in line with the circular series of ball-like projections I1. The open end of the bell-shape partition is further supported within the shell I by struts I8 of glass.

A filament I9 is located within the inner wall 9 of the double-walled partition and a nlament 29 is located in the shell I surrounding the double-walled partition. As shown in Figure 6, the filament I9 is supported at spaced points on the wall 9 by pins`2I while the filament 26 as shown in Figure 5 is supported at the base' points on the outer wall I0 of the partition by spaced pins 22. The wiring for the filaments I9 and 20 as shown in Figures 1 to 6 and 21 includes a conductor 23 extending through a portion of the b ase section 2 with one end anchored in a contact 24 communicating with the chamber 25 in the base section 2 while the other end communicates with a pin 26 attached to one end of the filament I9, said pin 26 being anchored in an enlarged portion of the wall 9. A pin 21 anchored in the wall 9 and attached to the other end of the filament I9 is in communication with the conductor 28 extending to a portion of the base section 2 for engagement with the element 29 that is grounded to the metallic casing I5.

The wiring arrangement for the resistance 28 includes a pair of pins 39 and 3| mounted in the wall I0 of the bell-shaped member and respectively attached to adjacent ends of the filament 28, the pin 30 being connected to a conductor 32 that extends to a portion of the base section 2 for attachment to the contact 33 in the chamber 25. A conductor 34 is attached to the pin 3| and extending through a portion of the base section 2 is grounded as at 35, on the metallic casing I5. The pair of movable contacts is associated with the contacts 24 and 33 and as shown in Figures 1 to 4 and 13 to 17, a tapering block having stepped portions 36 and 31 formed of conducting material and carrying a terminal 38 exposed at the base of the lamp is mounted in a socket in the base section 2a, the section 36 of the conductor block carrying a pair of resilient contact arms 39 and 48 that extend, into the chamber 25 in normally spaced relation to the contacts 24 and 33 as diagrammatically illustrated in Figure 21. To anchor the conductorvblock within the socket in the base section 2 against rotation, the section 36 of the conductor block is provided with a rectangular socket 4I opening toward the chamber 25 for the reception of the removable rectangular block 42 shown in Figure 15 as having rectangular socket 43 in its lower end to -receive a rectangular. key projection 44 rising from a disk 45 shown in detail in Figures 16 and 17 and which disk is suitably anchored at the inner end of the chamber 25 in the base section 2. The disk 45 is diametrically notched as at 46 for passage of the resilient contact arms 39 and 46. A multiple-switch device for operation of the resilient contact arms 39 extends across the chamber 25 and is journalled in the opposite side walls of the base section 2 and metallic casing I5 and as shown in Figures 1 to 4, 10, 11 and 18 to l 20, the multiple-switch device comprises a cylindrical shaft 41 having an annularly reduced por-l tion 48 intermediate its ends with one end further annularly reduced and externally threaded as at 49, the cylindrical shaft comprising the sections 41, 48 and 49 having a bore 5I) extending longitudinally therethrough that is rectangular in cross-section as shown in Figures 11 and 12. The larger portion 41 of the shaft carries a disk head 5I at its outer end and the bore 50 is closed by the wall 52 apertured as illustrated for purposes presently` to appear. Spanner wrench openings 53 are formed in the outer` face of the disk head 5I. An internally threaded sleeve 54 is threaded onto the threaded end 49 of the shaft 41 and moves into abutting engagement with the adjacent end of the annularly reduced portion 46 of the shaft 41, the larger portionof the shaft 41 and the sleeve 54 being of the same diameter as illustrated in Figures 4 and 10. A disk head 55 is carried by the outer end of the sleeve 54 and is provided with Spanner wrench openings 56 in its outer face, the disk head 55 having a central opening51 therein communicating with the bore in the shaft 41.

A rod 58 rectangular in cross-section is dmensioned for sliding interfitting engagement in the bore 50 in the shaft 41, one end of the rod 58 carrying a disk 59 that is engaged with the disk head on the sleeve 54 with a finger piece of handle 68 on the rod 58 outwardly of the disk 59. The other end of the rod 58 engages the closure wall 52 in the disk head 5I carried by the shaft 41 and said rod 58 as shown in Figure 20 has a. threaded socket 6I at the end thereof adjacent the wall 52 to receive the headed screw 62 passed through the apertured wall 52, theheaded screw 62 and the disk 59 upon the rod 58 coacting to hold the shaft 4'1 and sleeve 54 in assembled relation. 'I'he multiple-switch device extends transversely of the chamber 25 in the base 2 and the disk heads 5I and 55 rest in seats in the outer sides of the metallic casing I5 as shown in Figure 4, with the switch device disposed between the resilient contact legs 39and 40 as shown in Figures 1 to 3. An insulation block 63 in the form of a sleeve is anchored to the annuarly reduced portion 48 of the shaft 41 and is clamped between the adjacent end of the sleeveA 54 and the adjacent shouldered end of the shaftportion 41, the insulation sleeve 63 carrying four radially extending switch fingers, two of the ngers 64 being diametrically opposite, while the other two fingers 65 and 66 extend at acuteangles to one of the iingers 64 asshown in Figures 1 to 3.

From the above detailed description of the invention, it is believed that the same will at once be understood, it being noted that when the switch device is rotated by means of the finger piece or handle 60, both switch fingers 64 may be simultaneously engaged with the resilient contact arms 39 and 40 for moving them into engagement with the stationary contacts 24 and 33 for simultaneously illuminating the filaments I9 and 28. Other rotary movements of the switch device selectively place the fingers 65 and 66 in contact with the resilient contacts 39 and 40 respectively for selective illumination of the filaments I9 and 26.

While there is herein shown andA described the preferred embodiment of the invention, it is nevertheless to be understood that minor changes .neous illumination o f the fllaments, the outer may be made therein without departing from the spiritand scope of the invention as claimed.

I claimzl. In a multi-filament electric light bulb, a bulb casing and a base, a bell-shaped double walled member therein, a filament in the bellshaped member and a filament inl the casing surrounding the bell-shaped member, and switch mechanism in the base for selective and simultaneous illumination of the filaments.

2. In a multi-filament electric light bulb, a bulb casing and a base, a bell-shaped double walled member therein, a filament in the bellshaped member anda filament in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultafaces of the bell-shaped double wall member having a reflecting coating and a circular series of ball-like hollow projections carried by the outer wall of the bell-shaped member.

3. In a multi-filament electric light bulb, a

y bulb casing and a base, a bell-shaped doublelil Cil

walled member therein, a filament in the bellshaped memberand a filament in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultaneous illumination of the filaments, the switch mechanism including a pair of fixed contacts respectively communicating with a filament, a

pair of cooperating resilient contact arms and a rotatable member carrying switch fingers for moving the resilient contact arms into engagement with the fixed contacts.

4. In a multi-lament electric light bulb, a bulb casing and a base, a bell-shaped doublewalled member therein, a lament in the bellshaped member and a filament in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultaneous illumination of the filaments, the outer faces of the bell-shaped double wall member having a reiiecting coating and a circular series of ball-like hollow projections carried by the cuter wall of the bell-shaped member, the switch mechanism including a pair of fixed contacts respectively communicating with a filament, a pair of cooperating resilient contact arms and a rotatable member carrying switch ngers for moving the resilient contact arms int o engagement with the fixed contacts.

5. In a multi-filament electric light bulb, a bulb casing and a-base, a bell-shaped doublewalled member therein, a filament in the bellshaped member and a filament in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultaneous illumination of the filaments, the switch mechanism including a pair of flxed contacts in the base of the lamp respectively communieating vwith the laments, a pair of resilient contactarms, a shaft journalled transversely of the lamp base and radial switch fingers carried by the shaft for moving the resilient contact arms intoengagement with the fixed contacts.

6. In a multi-lament electric light bulb, a bulb casing and a base, a bell-shaped doublewalled member therein, a lament in the bellshaped member and a filament in the casing surrounding the' bell-shaped member, switch mechanism i`n the base for selective and simultaneous illumination of the filaments, the outer faces of the bell-shaped double wall member having a reflecting coating and a circular series of ball-like hollow projections carried by the outer wall of the bell-shaped member, the switch mech- -anism including a pair of fixed contacts in the base of the lamp respectively communicating with the filaments, a pair oflresilient contact arms, a shaft journalled transversely of the lamp base, and radial switch ngers carried by the shaft for moving the resilient contact arms into engagement with the fixed contacts.

7 In a multi-filament electric light bulb, a bulb casing and a base, a bell-shaped double walled member therein, a filament in the bell-shaped memberand a filament in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultaneous illumination of the filaments, the switch mechanism including a pair of xed contacts in the base of the lamp respectively communicating with the ,'laments, a pair of resilient contact arms, a lshaft journalled transversely of the lamp base and radial switch fingers carried by the shaft for moving the resilient contact arms into engagement with the fixed contacts,the journalled shaft including a pair of threadedly connected members, each having a head at its outer end positioned exteriorly of the lamp base and e'ngaged therewith.

8. In a multi-filament electric light bulb, a

bulb casing and a base, a bell-shaped double Walled member therein, a filament in the bellshaped member and a filament-in the casing surrounding the bell-shaped member, switch mechanism in the base for selective and simultaneous illumination of 4the filaments, the outerffaces of the bell-shaped double wall member having a reflecting coating and a circular series of ball-like hollow projections carried by the outer wall of the bell-shaped member, the switch mechanism including `a pair of fixed contacts in the base of the lamp respectively communicating with the filaments, a pair of resilient contact arms, a shaft journalled transversely of the lamp base, and radial switch fingers carried by the shaft for moving the resilient contact armsinto engagement with the fixed contacts, the journalled shaft including a pair of threadedly connected members, each having a head at its outer-end positioned exteriorly of the lamp base and engaged therewith.

NICK ZAGMESTER. 

